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<title>web.xml Visual Editor: Environment Entries</title>
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<h1>web.xml Visual Editor: Environment Entries</h1>
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<p>Use the Environment Entries section to add, remove, and view the web application's environment variables. Application environment entries are initialization variables that are available throughout a web application. You can use them, for example, to validate the object's type. 
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<p>You access application environment variables in the <code dir="ltr">java:comp/env</code> context through a JNDI lookup, unlike context parameters, which you access via a <code dir="ltr">ServletContext</code> object. So, you would extract the value of an application environment variable as shown in <a href="#CHDFAHIH">Example: Extracting the value of an application environment variable</a>.</p>
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<p>Example: Extracting the value of an application environment variable</p>
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InitialContext context = new InitialContext();
String header = (String) context.lookup("java:comp/env/headerPage");
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<p>The JNDI lookup method expects the type specified by the <code dir="ltr">env-entry-type</code> element and throws an exception if the returned value is not of that type.</p>
<p>To declare an application environment variable, you must register it in the web.xml file. When you do this, you provide information needed by the server to use the parameter. You tell the server which value should be returned when an environment entry is referred to in the web application.</p>
<p>In the Visual Editor, click <b>References</b> at the top of the editor to open the References section, then click the Environment Entries header to open the Environment Entries section. 
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<p>Click <b>Add</b> to define an environment entry element with the following properties:</p>

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<th align="left" valign="bottom" id="r1c1-t17">Element</th>
<th align="left" valign="bottom" id="r1c2-t17">Description</th>
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<p>Entry Name</p>
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<td align="left" headers="r2c1-t17 r1c2-t17">Specifies the variable's name, such as <code dir="ltr">headerPage</code>.</td>
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<p>Entry Type</p>
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<td align="left" headers="r3c1-t17 r1c2-t17">Specifies the variable's name for validation, such as <code dir="ltr">java.lang.String</code>.</td>
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<p>Entry Value</p>
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<td align="left" headers="r4c1-t17 r1c2-t17">Specifies the parameter's value, such as <code dir="ltr">mypages/header-0034.html</code>.</td>
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<p>Description</p>
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<td align="left" headers="r5c1-t17 r1c2-t17">Specifies a description, such as H<code dir="ltr">eader Page for Travel Agency Application</code>.</td>
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<hr><p><b>Related Topics</b></p>
<p><i>Developing Applications with NetBeans IDE</i>, 
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<p><i>Developing Applications with NetBeans IDE</i>, 
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<param name="content" value="http://www.oracle.com/pls/topic/lookup?ctx=nb8200&id=NBDAG1111">
<param name="text" value="<html><u>&quot;Configuring a Web Application&quot;</u></html>">
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<param name="textColor" value="blue">
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